Why is brood sometimes capped?

Why is honeybee brood sometimes capped and sometimes not capped? Brood moves through developmental stages: egg, larvae, pupae, adult. Eggs and larvae are in open cells so that worker bees can feed the larvae, and pupae are in closed cells because they are finished eating until they mature into adult bees.
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[@phillipschris2274]

We are new to the bee world. You are such an amazing teacher. So glad I came across your channel.

[@thehoneycompany]

Right?! That would NOT be fun. Glad it helped.

[@curtis3757]

Great video..I am learning a lot about honey bees